Where to go next with the turntable

I have owned a Rega P9 RB1000 turntable since 2012. Started with an AT OC9 MK2 then upgraded to a Goldring Legacy while keeping my Allnic H 1200 phono preamp. Have also upgraded the standard feet to a set of Spiral Groove footers and have added a Herbie’s Audio record mat/HRS record weight. These upgrades have softened the slight aggressiveness and added a level clarity and cohesiveness. My advise would be consider the P10 or even the Naia, upgrade the Hegel then add a Koetsu Rosewood or Hana Umami Red to add warmth and full bass.

Get thee a tonearm with removable headshell! 

You can get the few inexpensive tools and gather the skills to align a cartridge.

Then, Stereo MM; Stereo MC; Mono; other alternates, hear friend's cartridges on your system, ....

dayglow, thanks.

Actually I just upgraded to the Hegel from a Musical Surroundings Phonomena II+ which is quite a bit better. 😀
I may look at a Herbies mat again, but the last time I tried a record weight on the Rega, it was not an improvement (on this particular table). 
FYI I do have the table sitting on a IsoAcoustics ZaZen platform which got rid of the groove noise. 

There is a whole world of exceptional turntables out there. Particularly if you can push to around $5K or higher. Performance takes a big jump. I would look at a VPI Prime for instance. Linn has the advantage of allowing you to start at nearly any level and slowly upgrade on subcomponents at a time to the very top level audiophile. There are many high end choices offering exceptional performance.